femtomole

F4E1M3T1O1M3O1L1E1

noun

A billionth of a millionth (10⁻¹⁵) of a mole. Symbol: fmole

OriginEnglish mole ← Danish femten ← Old Norse fimmtán →
Scrabble 16
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Meanings

nounfemtomole (plural femtomoles)

plural femtomoles

  1. chemistryA billionth of a millionth (10⁻¹⁵) of a mole. Symbol: fmole

Origin

  1. Proto-Indo-European*pénkʷe
  2. Proto-Germanic*fimf
  3. Proto-Indo-European*déḱm̥
  4. Proto-Germanic*tehun
  5. Proto-Germanic*fimftehun
  6. Old Norsefimmtán
  7. Danishfemten
  8. Englishfemto-
  9. Englishmole
  10. Englishfemtomole

From femto- + mole.

Full word history & related roots →
Cite this entry
APA

femtomole. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/femtomole

MLA

“femtomole.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/femtomole. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “femtomole,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/femtomole.

Source: femtomole on Wiktionary, CC BY-SA 4.0.